tonight, tens of thousands stranded in the deserts after monsoon rains swamp the burning man festival. in the northeast, the potentially record-breaking heat wave. starting this labor day weekend. first, that monsoon flooding overwhelming las vegas. authorities investigating a possible drowning victim tangled in debris. vehicles struggling to get through the high water on the vegas strip. those downpours causing chaos at the burning man festival. organizers urging people to

shelter in place after the desert turned into a giant mud pit, closing the one escape route for most vehicles. and millions in the northeast tonight bracing for dangerous heat. our weather team standing by. also tonight, authorities say an escaped convicted killer has been seen on camera. the manhunt intensifying out philadelphia for the prison inmate convicted of fatally stabbing an ex-girlfriend 38 times. homeowners warned to stay inside as police close in. shot at random. a college student gunned down at the start of the school year. the alleged gunman seen talking to him before opening fire. the suspect admitted to killing the victim for no discernible reason and saying he might have shot more people if he hadn't run out of ammunition. >> frightening new video just coming in. the gender reveal horror. a small plane releasing pink smoke then crashing to the ground. what we have learned about the pilot.

friday night lights mars by violence. a 12-year-old is shot in baltimore outside a high school football game. a 16-year-old killed in louisiana. what's happened to this proud american tradition? remembering bill richardson, the former governor and ambassador who was instrumental in freeing americans detained overseas. including former marine trevor reed and wnba star brittney griner. the search for an arsonist in louisiana. the investigation now as officials say the largest wildfire in state history was deliberately set. and americans pay tribute to the mayor of margaritaville, jimmy buffett, a treasured performer who invited us all to share in his paradise. >> announcer: from abc news world headquarters in new york, this is "world news tonight." good evening. it's great to have you with us on this sunday night. i'm whit johnson. several developing stories. the new sighting of a convicted killer and urgent manhunt outside philadelphia.

but we begin with the extreme weather across the country this holiday weekend. monsoon rains slamming the southwest, at least one death reported in the chaos of the burning man festival in nevada. tens of thousands trapped, told to conserve water and food. thick mud making it difficult to get out. even stars like chris rock among those fleeing the desert. downpours reaching across the normally hot and dry region. roads turning into rivers near the las vegas strip. authorities are now investigating a drowning death in the city. and the calendar may say september, but it feels like the beginning of august for millions along the east coast, as the heat builds up over the next few days. major cities reaching well into the 90s. we'll have the forecast in just a moment. we start with the flooding in the west. abc's zohreen shah leads us off. >> this is insane. >> reporter: tonight, those heavy monsoon rains wreaking havoc in the west now turning possibly deadly.

in west las vegas valley, authorities launching an investigation after fire crews found a possible drowning victim tangled in debris. and tonight, authorities say they're investigating at least one death at burning man, the annual counterculture arts festival in the black rock desert north of reno, nevada. tens of thousands stranded after major flooding cut off the festival's soleigate away for most motor vehicles and emergency crews. >> they shut the water down. i'm helping to pull power cables outs of the ground. >> reporter: the event ending tomorrow, but it's unclear when everyone will be able to leave. officials urging attendees to conserve water, food, and fuel. >> people are walking out. i have friends in our camp that hiked out yesterday. >> reporter: so far, the only way out, trudging at least five miles in the mud to a paved road. >> we walked three miles. we have five more. >> reporter: celebrity dj diplo sharing these posts showing him and chris rock making the journey. before negotiating a ride from a fan.

across the region, flash flooding closing down the i-15 highway south of las vegas. >> this is crazy. >> reporter: and turning this busy intersection into a raging river. this bus appears to narrowly miss a submerged car. the storm also making hazardous conditions on lake tahoe this holiday weekend. >> some dramatic images coming out of the west tonight. zohreen shah joining us now. what is the latest now for those attendees stuck in the burning man festival? >> reporter: so that festival officially ends tomorrow, but i just touched base with someone who is there right now, and they expect to be there until tuesday at this rate. tonight, we're learning president biden has been briefed on the situation at burning man. whit. >> all right, thank you. that flooding is just part of the weather extremes being felt across the country this holiday weekend. let's bring in meteorologist leslie lopez from our station kabc in las vegas. millions are also facing a dangerous heat wave. >> reporter: that's right.

and it looks like this upcoming heat wave is sticking around for much of the upcoming week and parts of the northeast. they're just starting to feel the heat. the center of the country is dealing with the worst of it. the heat is intensifying for the labor day holiday along much of the i-95 corridor. the heat challenging records from the upper midwest to the northeast over the next several days and the first week of september featuring multiple 90 degree days from d.c. to philly and new york city. relief moves in for many by the end of the week, however, more unseasonably hot conditions will move in for the middle of the month. in parts of the south and west. whit. >> thank you. great to have you with us tonight. turning now to the urgent manhunt for an escaped convicted murdering spotted this weekend on a home security camera taken less than two miles from the prison where he escaped from outside philadelphia. he was just sentenced to life in prison for the murder of his ex-girlfriend. here's abc's jay o'brien. tonight, pennsylvania law enforcement officials say this

is new video of convicted murderer moving through the bushes outside a home near the prison he escaped. >> we believe we are getting closer to locating this suspect at this time. >> reporter: the chester county district attorney's office releasing this black and white home security camera footage hoping for the public's help in tracking down the 34-year-old sentenced not even two weeks ago to life in prison for stabbing his ex-girlfriend multiple times in front of her children. >> remain inside. lock your doors. lock your cars. he is still considered an extremely dangerous individual. >> this is right behind our house. >> reporter: authorities using drones and helicopters to search for the suspect in a heavily wooded residential area less than two miles from the chester county prison. >> i'm putting together a soccer goal for my daughter, and you know, a state trooper that has tactical gear on with a machine gun walks through my front yard.

it's just very surreal. >> reporter: officials believe the man who is also wanted for murder in his native brazil may have tried to break in to at least two homes. >> possible sighting of the prisoner. a male subject walking northbound. >> reporter: local, state, and federal authorities now involved in the search, warning residents to stay on the lookout just ahead of labor day. >> please remain vigilant with your observations. especially given the long holiday weekend where people may be out of town. it's very likely the suspect could attempt to break into one of those homes. >> reporter: and whit, locals are taking this seriously tonight, even a tourist attraction there, the sprawling longwood gardens, is on lockdown, posting a bright red alert on their website saying they are closed as the search continues. whit. >> an important warning. jay o'brien for us tonight, thank you. >> tonight, family and friends are mourning the death of a texas college student killed this weekend in what appears to be a random act of gun violence. wes smith, a junior at tcu and past member of the football

team, died after being shot three times on a ft. worth street. officials say smith does not appear to have known the suspect who is now charged with his murder. here's abc's jaclyn lee. >> reporter: tonight, a community in mourning over the fatal shooting of texas christian university junior wes smith killed by an apparent stranger outside a bar as he finished his second week of school. >> it hit hard, it hit hard. i think it's hard for a parent to lose their child in any way. >> reporter: according to a fort worth police arrest warrant, surveillance cameras show the suspect matthew purdy appearing to speak to smith after 1:00 a.m. friday. moments later, police say, purdy opening fire. the suspect fleeing but later arrested by officers in a nearby parking lot. the warrant says the suspect admitted to not knowing smith and shooting him three times, allegedly telling police he shot smith "in the head because he wanted to make sure he was dead."

the warrant says purdy also said he would have shot others if he hadn't run out of ammunition. tonight smith's family saying in a statement, "wes was truly an amazing and loving son, brother, cousin, and friend to so many. we are heartbroken by his passing. according to the arrest warrant, when officers asked the suspect why he shot smith, he was unable to give a clear answer. that suspect is now facing a murder charge and is behind bars tonight. >> jaclyn lee, thank you. overseas now to the war in ukraine. officials tell abc news the u.s. is expected to send depleted uranium rounds to ukraine as part of a new military aid package. experts say they could be a game changer on the battlefield, capable of piercing russian armor, but they have come under criticism. abc's britt clennett from ukraine tonight. >> reporter: tonight, a potential game changer in ukraine's bloody battle to drive russian forces out of its territory. abc news sources confirming for the first time the u.s. will

likely send ukraine depleted uranium rounds in the next aid package, munitions that can be fired from american abrams tanks, which are expected to be on the battlefield soon. with ukraine's counteroffensive making slow gains in the south, experts say these shells are extremely effective at piercing the thick armor of russian tanks. >> it's very effective as an anti-tank munition. that's because it's very dense, it's a very dense metal and upon impact with an enemy tank, it has a self igniting, fire-producing effect. so it's very useful to punch against enemy armor. >> reporter: while these types of munitions have been criticized by some groups the un's nuclear watchdog saying there's no proof it "poses a radiological hazard to populations." the news comes as russia unleashed another drone attack overnight, seen damaging a port in the odesa region, critical to exporting grain. two people were injured.

president zelenskyy announcing he's replacing his defense minister who was accused of corruption earlier this year. zelenskyy said it's time for new approaches in the defense ministry. whit. >> thanks to you tonight. back here at home, the alarming trend of violence near high school football games. multiple shootings during friday night lights heading into the weekend. at least one teenager killed. here's abc's alex presha. >> reporter: friday night lights turning into a frantic nightmare. this baltimore football game winding down. then gunfire sending the crowd scrambling for safety. a shooting just across the street injuring a 12-year-old. >> you have over 1,000 people in the stands getting trampled and running on the field. that's a frightening sight. >> reporter: the chaos in baltimore part of a series of

shootings at or near friday night high school football games around the country as families gear up for this year's season. in west baton rouge, a 16-year-old was killed and a 28-year-old woman injured in a shooting just outside the port allen high school stadium. in chicago, two teens injured, one critically at a shooting at the end of the game. and in toledo -- >> there is a football game right now. >> reporter: police say this 911 call possibly thwarted another high school football game shooting. body camera footage showing the arrest of a 19-year-old armed suspect. and tonight, that suspect is charged with illegally carrying a firearm onto school grounds. toledo police praising the woman that tipped them off, saying she saw something and said something. whit. >> alex presha reporting for us tonight. thank you. tributes are pouring in for former new mexico governor and ambassador to the u.n. bill richardson. the 75-year-old statesman may be best remembered for his unofficial efforts to help free dozens of americans wrongfully detained in other countries,

including wnba star brittney griner. here's abc's maryalice parks. >> reporter: tonight, tributes pouring in for bill richardson, the former governor of new mexico with a storied political career, devoting his later years as a private citizen to bringing american hostages home. >> we have to bring american hostages home, especially those wrongfully detained. >> reporter: richardson worked on behalf of some 80 american families to secure the release of their loved ones, among them, former marine trevor reed and wnba superstar, brittney griner. as he worked to help free griner, richardson spoke to our george stephanopoulos. >> i've been talking to the russians. i talked to the white house. i'm a catalyst. >> reporter: today, griner saying she "will be forever grateful for all of his efforts to help bring me home from russia." president biden writing in a statement "he seized every chance to serve and met every new challenge with joy." richardson began his career as a congressional staffer, later representing new mexico in the house of representatives. under president clinton, he

served as the nation's ambassador to the united nations and energy secretary. richardson earned multiple nominations for the nobel peace prize. he led nuclear talks with north korea and brokered a truce in darfur. richardson also made history, as the first hispanic governor of new mexico and the first hispanic to seek the democratic party nomination for president, in 2008, campaigning in english and spanish. [ speaking in non-english ] >> reporter: richardson was 75 the richardson center for global engagement said in a statement that he died friday at home in his sleep. he is survived by his daughter and his wife of 50 years who was there by his side. whit. >> maryalice parks, thank you. president biden this weekend seeing first-hand the zone of destruction left by hurricane idalia. the president pledging the federal government's total support for residents there.

he was joined by florida republican senator rick scott. missing was florida governor ron desantis who said the president's trip would be disruptive. >> he may have had other reasons, but he did help us plan this. he sat with fema and decided where we should go, where would be the least disruption. >> desantis toured other parts of the state impacted by idalia this weekend. there's still much more ahead on "world news tonight" this sunday, including the horror when a gender reveal party went terribly wrong. and why police are now involved in the largest wildfire in louisiana state history. ♪ i have type 2 diabetes, but i manage it well. ♪ ♪ jardiance ♪ ♪ it's a little pill with a big story to tell. ♪ ♪ i take once-daily jardiance, ♪ ♪ at each day's staaart. ♪ ♪ as time went on it was easy to seee. ♪ ♪ i'm lowering my a1c. ♪ jardiance works 24/7 in your body to flush out some sugar! and for adults with type 2 diabetes

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finally tonight, americans are remembering a performer who could change anyone's attitude with just a few notes. ♪ went down away again in margaritaville. >> tonight, across the country, fans of jimmy buffett are coming together to grieve and celebrate the legendary singer. floral leis adorning his "shrimpboat sound" recording studio in key west, florida. >> no matter wherever else he built a house, or wherever he decided to reside for the moment, key west was always home. >> reporter: and a margarita for the songwriter who took us all to "margaritaville." >> he's doing another show now, but it's in the sky. >> reporter: on new york's long island, a tribute concert

honoring buffett at jones beach. buffett's laid-back hawaiian shirts and tropical rock music, synonymous with his on-stage and business brands spanning over his five-decades-long career. his seventh album, released in 1977, starred his greatest hit single "margaritaville," selling over 20 million records. ♪ some people claim that there's a woman to blame ♪ and other anthems like "cheeseburger in paradise." ♪ cheeseburger in paradise ♪ and "come monday." ♪ come monday i'll be holding you tight ♪ >> reporter: buffet also known for starting his own environmental and social charities. buffet pfl's official website revealing he had been fighting merkel cell skin cancer if four years but continued to perform

during treatment. jimmy buffet was 76. >> a beautiful soul. there won't be another songwriter like that. >> his music touching so many. thanks for watching tonight. i'm whit johnson. have a great night.

janai: hey, everyone, i'm janai norman, and we're about to cross the continent to see earth's most magnificent mammals. welcome to "oh baby!". today, we're mounting a mission to meet the cutest furry faces from around the globe, like this mama bear and her cubs heading out from hibernation. it's all fun and games for these cute characters of the cold. and later, we'll see a unique style of heavyweight hygiene. but first, what better way to get into the swing of things than with some perky primates.